2 Answers
2

When trying to do any administrative task like installing an application or upgrading the system, you will always need to have administrative rights. This can be achieved in several ways, 2 of them are:

To actually BE the root user (Not recommended. Too much power in your hands. /godmode 1)

Prefix any command line with the command sudo.

In your case I recommend doing the second option. And to be sure, do a clean upgrade like this (This way you have less chance to come up with a bug while doing the upgrade, before it or after the upgrade).

sudo apt-get update && sudo apt-get upgrade

After everything is done then execute the following:

sudo apt-get dist-upgrade

This way you can see if the system is ok before doing the version upgrade.